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Home/Mold Testing/Frederick County, VA
Mold testing
Samples taken in your home, analysed by an accredited laboratory. We do not sell remediation, so the report has nothing to sell you.
4.9 rating, over 4,000 reviews NAMRI-certified inspectors Serving all of Frederick County
Schedule a mold test Call (703) 450-6398 Find your community
Two communities in the county have pages of their own with local detail. The packages, the prices and the laboratory are the same everywhere in the county, so you can also book straight from here.
Stephens City's Main Street sits on the old Valley Pike, with later subdivisions spreading south along the same route.
Winchester's independent city limits sit near the county's center, with newer county subdivisions ringing its older streets on every side.
Winchester is an independent city entirely surrounded by the county; it is not part of Frederick County's government, but the same team, packages and prices cover it.
Four options, depending on how much of the home you need looked at. Not sure which one fits? Start with the thirty minute visit and a technician will tell you what is actually worth testing. Decide to test while they are there and the visit is written up as a Mold Plus.
No sampling
"Something feels off and I do not know if testing is worth it."
$175
30 minutes on site
One area, tested
"I can see it, or I know exactly where to look."
$345
One targeted area, 1 to 2 hours
One area, plus the source
"There was a leak and I want to know where the water went."
$495
One targeted area, 1 to 2 hours
The whole home
"It could be anywhere, or it keeps coming back."
From $550
Priced by home size, 1 to 2 hours
* Prices shown are for Virginia and Maryland. In Washington DC, Mold Basic is $425, Mold Plus is $575, and Mold Advanced starts at $630. Mold Walk & Talk is $175 everywhere.
Frederick County wraps around the independent City of Winchester, and its own growth followed the roads leading out from that center. The Valley Pike carried the county's oldest crossroads settlements south to Stephens City, and newer subdivisions filled the land between those towns and the Winchester city line from the late twentieth century onward. Farther from the pike, the county turns to orchards and open farmland. A booking anywhere in the county starts with two facts: which side of the Winchester line the house sits on, and how the lower level was built.
A 2005 USGS study conducted with Frederick County found that about a quarter of the county, or roughly 105 square miles, is underlain by carbonate bedrock that has weathered into the fractured, cavity-riddled ground typical of the Shenandoah Valley. On that ground a technician watches for settling cracks and sinkholes near the foundation before any sample is taken. Away from the carbonate belt, the county's other rock holds water closer to the surface, so the more common path indoors is a crawlspace vent, a roof valley, or a plumbing chase in one of the county's older farmhouses.
Local background: USGS: Hydrogeology and Ground-Water Availability in the Carbonate Aquifer System of Frederick County, Virginia (2005).
01
Part of the county sits on carbonate bedrock that dissolves into cavities, sinking streams and the occasional sinkhole. On that ground a foundation crack or a drain that seems to disappear gets photographed and measured before a sample is taken, since the pattern may trace back to the rock rather than the roof.
02
The county's old orchard land drains differently than a hillside subdivision, with irrigation lines and windbreaks holding water close to a foundation longer than open lawn does. A technician notes any irrigation or drainage feature near the crawlspace or slab before sampling, and the report says whether that feature lines up with the moisture found.
03
Many county farmhouses have a later addition or enclosed porch built at a different floor level than the original structure, and that seam is where a stain often starts. Samples are taken on both sides of the junction so the report can say which side is actually wet.
We do not remove mold, so we have nothing to gain from your results. If your report shows a problem, you choose who fixes it. Once the work is done, we can test again and tell you what we find.
Virginia's residential disclosure statement advises buyers to exercise due diligence, including considering a mold assessment conducted by a business following EPA guidance. Confirm the scope and timing with your agent before settlement. A laboratory sample documents a selected place and time; it does not certify an entire home as mold-free or replace advice about your transaction.
Va. Code section 55.1-703. Current as of September 2026. General information, not legal advice.
Yes. The same team, packages and prices reach every part of the county, from Stephens City on the Valley Pike to the orchards and farmland farther out. The community pages linked here add local detail, and any of them can start a booking.
It depends on the specific street. Winchester is an independent city entirely surrounded by the county, so a Winchester mailing address can sit on either side of that boundary. Give us the full street address when booking so the report names the correct jurisdiction; the visit, the lab work and the prices are the same either way.
Not automatically. That kind of bedrock is a description of drainage and settling risk, not of what is growing indoors. A house on carbonate ground with a dry, well-graded foundation can test clean, while a house on ordinary ground with a failed gutter or crawlspace vent does not. The test measures what is actually present at the property.
Yes. Describe which sections are original and which were added later when you book, since that history helps target where samples are taken. The visit covers every space you want documented, from the oldest room to the newest addition.
Real availability on the next screen. No call back required.
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NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398
